/*
 * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xml.internal.serializer;

import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;


/**
 * This class writes ASCII to a byte stream as quickly as possible.  For the
 * moment it does not do buffering, though I reserve the right to do some
 * buffering down the line if I can prove that it will be faster even if the
 * output stream is buffered.
 * <p>
 * This class is only used internally within Xalan.
 *
 * @xsl.usage internal
 */
class WriterToASCI extends Writer implements WriterChain {

    /**
     * The byte stream to write to.
     */
    private final OutputStream m_os;

    /**
     * Create an unbuffered ASCII writer.
     *
     * @param os The byte stream to write to.
     */
    public WriterToASCI(OutputStream os) {
        m_os = os;
    }

    /**
     * Write a portion of an array of characters.
     *
     * @param chars  Array of characters
     * @param start  Offset from which to start writing characters
     * @param length Number of characters to write
     * @throws IOException         If an I/O error occurs
     * @throws java.io.IOException
     */
    public void write(char chars[], int start, int length)
            throws java.io.IOException {

        int n = length + start;

        for (int i = start; i < n; i++) {
            m_os.write(chars[i]);
        }
    }

    /**
     * Write a single character.  The character to be written is contained in
     * the 16 low-order bits of the given integer value; the 16 high-order bits
     * are ignored.
     *
     * <p> Subclasses that intend to support efficient single-character output
     * should override this method.
     *
     * @param c int specifying a character to be written.
     * @throws IOException If an I/O error occurs
     */
    public void write(int c) throws IOException {
        m_os.write(c);
    }

    /**
     * Write a string.
     *
     * @param s String to be written
     * @throws IOException If an I/O error occurs
     */
    public void write(String s) throws IOException {
        int n = s.length();
        for (int i = 0; i < n; i++) {
            m_os.write(s.charAt(i));
        }
    }

    /**
     * Flush the stream.  If the stream has saved any characters from the
     * various write() methods in a buffer, write them immediately to their
     * intended destination.  Then, if that destination is another character or
     * byte stream, flush it.  Thus one flush() invocation will flush all the
     * buffers in a chain of Writers and OutputStreams.
     *
     * @throws IOException If an I/O error occurs
     */
    public void flush() throws java.io.IOException {
        m_os.flush();
    }

    /**
     * Close the stream, flushing it first.  Once a stream has been closed,
     * further write() or flush() invocations will cause an IOException to be
     * thrown.  Closing a previously-closed stream, however, has no effect.
     *
     * @throws IOException If an I/O error occurs
     */
    public void close() throws java.io.IOException {
        m_os.close();
    }

    /**
     * Get the output stream where the events will be serialized to.
     *
     * @return reference to the result stream, or null of only a writer was
     * set.
     */
    public OutputStream getOutputStream() {
        return m_os;
    }

    /**
     * Get the writer that this writer directly chains to.
     */
    public Writer getWriter() {
        return null;
    }
}
